Optical Fiber Transmission Distance exceeds 12 thousand km without relay

Optical Fiber Transmission Distance exceeds 12 thousand km without relay

Optical Fiber communication (fiber-optic communication) refers to the use of optical and optical Fiber (optical fiber) to transmit information, is a type of wired communication. The optical fiber can not only transmit analog and digital signals, but also meet the needs of video transmission. The data transmission rate of a single optical fiber can reach several Gbps, without a repeater, the transmission distance can reach dozens of kilometers.

Today, optical fiber communication has become the most important wired communication mode with many advantages such as high transmission capacity and good confidentiality. However, when the optical signal is transmitted within the optical fiber, it degrades as the transmission distance increases. When the optical signal is smaller than a fixed value, the optical receiver cannot correctly identify the optical signal encoding after receiving the optical signal, transmission Error. Therefore, when using optical fiber (optical fiber) for long-distance transmission (hundreds, thousands of kilometers or more), an optical fiber repeater must be added to enable long-distance transmission of optical signals.

According to foreign media reports, researchers at the University of California, San Diego recently broke the obstacle of optical signal propagation distance without relay. When only standard amplifiers are used, the transfer distance of information in Optical Fiber exceeds 12000 kilometers (nearly 7500 miles )!

Nikola Alic, the principal leader of the research project, said that increasing power can increase the optical fiber transmission distance, but when it exceeds a specific value, it will cause serious signal distortion, as a result, the long-distance transmission fails. This is like a quicksand. The tighter the catch, the faster the hourglass. We solve this problem through the frequency comb technology.

 

Broadband Frequency combs ensure that crosstalk between multiple communication channels is reversible in the same optical fiber.

It is understood that the "frequency comb" can ensure that information distortion (so-called crosstalk) in fiber propagation can be predicted and foreseeable at the receiving end, that is, the broadband frequency comb ensures that the crosstalk between multiple communication channels is reversible in the same optical fiber.

 

Principles

In optical fiber, transmission information is transmitted through multiple communication channels to produce different frequency bands, and the change frequency of optical flow information is synchronized using the "frequency comb, that is, the so-called optical Fiber propagation "optical carrier" ("optical carriers"), so that the crosstalk between multiple communication channels in the same optical fiber can be compensated in advance, it also ensures that crosstalk between transmission channels is visible.

Simply put, with the help of "Frequency combs", it breaks through the shackles that increase the power of optical signals, so that it can transfer more than 12000 kilometers without using relay, this innovation will bring about faster and cheaper optical transmission networks, especially in the construction of long-distance intercontinental submarine optical fiber cables, with unlimited prospects!